Orbit Estimation Options

Additions to the estimation state structure depend on the setting of the Motion Model.

Orbiter: ODTK adds the six-element orbit state to the overall estimation state for filter and simulator processes using this satellite. It also adds state elements for the estimation of atmospheric density, ballistic coefficient, solar pressure coefficient, and finite maneuver corrections for this satellite if required by the force modeling.
Lander: ODTK adds the position of the spacecraft on the indicated central body to the overall estimation state.

Select one of the following values for the EstimateOrbit property:

Orbit Estimation Options
Option	Description
true	ODTK adds the six-element orbit state to the overall estimation state for filter and simulator processes using this satellite. It also adds state elements for the estimation of atmospheric density and solar pressure coefficient corrections for this satellite if required by the force modeling.
false	An EphemerisSource attribute appears, providing the following options: Reference Trajectory - to be used as a tracker platform in the simulator or filter. Meas File Embedded Trajectory - based on position data embedded in the tracking data. When using the Meas File Embedded Trajectory option, ODTK cannot model light time delay for SB Range measurements. Any measurements that include the tracker trajectory need to be corrected for light time delay beforehand, or the measurement noise must be increased to account for LTD values.

Option

Description

true

ODTK adds the six-element orbit state to the overall estimation state for filter and simulator processes using this satellite. It also adds state elements for the estimation of atmospheric density and solar pressure coefficient corrections for this satellite if required by the force modeling.

false

An EphemerisSource attribute appears, providing the following options:

Reference Trajectory - to be used as a tracker platform in the simulator or filter.

Meas File Embedded Trajectory - based on position data embedded in the tracking data.

When using the Meas File Embedded Trajectory option, ODTK cannot model light time delay for SB Range measurements. Any measurements that include the tracker trajectory need to be corrected for light time delay beforehand, or the measurement noise must be increased to account for LTD values.